- O Dever Me Chama
- The Amazing Circus
- O Mundo de Augusto
- O papagaio que não sabia falar
- O Show da Luna! Vamos Colorir
- Objects order: memory game
- Ocean - Find Matching Images
- Ocean Adventure Game for Kids!
- Animals of the Sea
- Ocean Animals and Sea For Kids and Toddlers
- Ocean Animals Coloring Book - for Kids
- Marine Animals - Puzzle, Coloring and Underwater Animal Games for Toddler and Preschool Children
- Ocean Animals Kid Shape Puzzle
- Ocean CleanUp !!
- Ocean Craft Multiplayer Online
- Ocean Doctor - Sea Fish Rescue
- Ocean Drawing Coloring Book - Cute Caricature Art Ideas pages for kids
- Ocean Fight War Fish Game
- Ocean Fish Coloring Pages for Toddlers and Kids
- Ocean Hidden Objects
- Ocean II - Toddlers Learning Games, Kids Ages 3
- Ocean Kids Abc Learning-alphabet and phonics game
- Ocean Mahjong
- Ocean Mania - Summer Game
- Ocean Marble Blast:Legend Shot
- Ocean Mermaid Salon & Dressup - Water World Makeover
- Ocean puzzle HD with colorful sea animals and fish
- Ocean Puzzle Packs Collection-A Free Logic Board Game for Kids of all Ages
- Oceania by BubbleBud Kids
- OceanuX Deluxe - Match 3
- Octagon brain teaser game
- OCTO Logic Puzzle
- October Style Dress Up - Makeover game for girls
- Octobo Fun & Games
- Octodad: Dadliest Catch
- Octopus Evolution
- Octopus Hunter
- Octopuz
- Oculux
- Odd and Even numbers
- Odd Socks
- Odd Squad Agent Academy
- Odd Squad: Artifact Adventure
- Odd Squad: Odd-mented Reality
- Odd Squad: Van Dashboard
- Oddbods Oddlife: Daily games
- Oddly Satisfying Soap Cutting!
- ODINsWORLD
- Odysseus: long way home Lite
- Off Now
- Off to Bed - Bedtime Stories
- Office Bottle Flip
- Office Jerk for iPad
- Officiel du SCRABBLE®
- Offroad Oil Tanker Truck Drive
- Offroad SUV Extreme
- Oggy and the Cockroaches
- Ogoola Karuta EN 100
- Oh ! The magic drawing app
- Oh Dear Dead Again
- OH HELL Scoreboard
- Oh Hell! Scores
- Oh My Pool! Everlasting summer
- Oi Frog!
- Oil Paint Art: Color By Number
- Oil Painting - Color By Number
- Okey
- Okey 101 - tile matching game
- Okey 101 Online